Melt the butter in a large stockpot over medium heat. Add the chopped onions and sauté for about 7 to 10 minutes until they are tender and somewhat translucent.
Add the turkey, breaking it up and mixing it into the onions. Cook until the turkey is no longer pink. Add the chopped garlic and cook for an additional 3 to 5 minutes.
Toss the red and green bell peppers along with the poblano pepper into the bowl of a food processor. Process until the peppers are finely chopped. Add the peppers along with any of their juices to the turkey and onions.
Stir in the flour until well combined and cook for about 3 minutes, stirring frequently.
Add the brown sugar, the Creole seasoning, cumin, oregano, cinnamon, and kosher salt mixing together with the turkey and vegetables.
Pour in the crushed tomatoes, the chopped tomatoes, 1 cup of the chicken stock plus the kidney beans and the bay leaves. Reduce the heat to low and continue cooking partially covered for about 1 hour, stirring frequently.
Check for seasoning, adding any additional kosher salt or Creole seasoning to suit your taste plus any additional stock for desired thickness.
Serve the chili hot topped with grated cheese and a dollop of sour cream.